Does Aruba support GRE tunnel between master and local controllers ?

Environment- This article applies to all the versions of Aruba OS and controllers

Answer-

Aruba does support GRE tunnel between master and local controllers.

However the GRE tunnels between master and local should use their "switch-IPs" as tunnel endpoints.

When the GRE tunnel endpoint is configured with the VRRP IP and not the switch ip of the master, the heartbeat replies on local pick up the route-cache entry for ike trigger. This results in heartbeats getting dropped and the tunnel may not come up properly.

"show datapath route-cache table" (this is the l2/l3 mapping table in the forwarding plane, since the local controller will prefer to choose the physical ip rather than the virtual ip.